September 11, 2001, attacks

The September 11 attacks (also referred to as September 11, September 11th, or 9/11)  were a series of four coordinated terrorist attacks launched by the Islamist terrorist group al-Qaeda upon the United States in New York City and the Washington, D.C. areas on September 11, 2001. On that Tuesday morning, 19 al-Qaeda terrorists hijacked four passenger jets, intending to fly them in suicide attacks into targeted buildings. Two of those planes, American Airlines Flight 11 and United Airlines Flight 175, were crashed into the North and South towers, respectively, of the World Trade Center complex in New York City. Both towers collapsed within two hours and falling debris, combined with fires that the debris initiated in several surrounding buildings, led to the partial or complete collapse of all the other buildings in the World Trade Center complex, also causing major damage to ten other large structures in the immediate area of the complex. A third plane, American Airlines Flight 77, was crashed into the Pentagon (the headquarters of the United States Department of Defense), leading to a partial collapse in its western side. The fourth plane, United Airlines Flight 93, was targeted at the United States Capitol^[2] in Washington, D.C., but crashed into a field near Shanksville, Pennsylvania after its passengers tried to overcome the hijackers. Almost 3,000 people died in the attacks, including all 227 civilians and 19 hijackers aboard the four planes.

Suspicion quickly fell on al-Qaeda, and in 2004, the group’s leader, Osama bin Laden, who had initially denied involvement, claimed responsibility for the attacks.^[1] Al-Qaeda and bin Laden cited U.S. support of Israel, the presence of U.S. troops in Saudi Arabia, and sanctions against Iraq as motives for the attacks. The United States responded to the attacks by launching the War on Terror and invading Afghanistan to depose the Taliban, which had harbored al-Qaeda. Many countries strengthened their anti-terrorism legislation and expanded law enforcement powers. Having evaded capture for years, bin Laden was located and killed by U.S. forces in May 2011.

The destruction of the Twin Towers and other properties caused serious damage to the economy of Lower Manhattan and had a significant effect on global markets. Cleanup of the World Trade Center site was completed in May 2002, and the Pentagon was repaired within a year. Numerous memorials have been constructed, including the National September 11 Memorial & Museum in New York, the Pentagon Memorial, and the Flight 93 National Memorial in Pennsylvania. After a lengthy delay, the 1,776-foot-tall (541 m) One World Trade Center is expected to be completed at Ground Zero in New York City in 2013.

Early on the morning of September 11, 2001, 19 hijackers took control of four commercial airliners (two Boeing 757 and two Boeing 767) en route to California (three headed to LAX in Los Angeles, and one to San Francisco) after takeoffs from Boston, Massachusetts; Newark, New Jersey; and Washington, D.C. Large planes with long flights were intentionally selected for hijacking because they would be heavily fueled.

The four flights were:

• American Airlines Flight 11: Left Boston’s Logan Airport at 7:59 a.m. enroute to Los Angeles with a crew of 11 and 76 passengers, not including five hijackers. The hijackers flew the plane into the North Tower of the World Trade Center at 8:46 a.m.
• United Airlines Flight 175: Left Logan Airport at 8:14 a.m. enroute to Los Angeles with a crew of nine and 51 passengers, not including five hijackers. The hijackers flew the plane into the South Tower of the World Trade Center at 9:03 a.m.
• American Airlines Flight 77: Left Washington Dulles International Airport in Virginia at 8:20 a.m. enroute to Los Angeles with a crew of six and 53 passengers, not including five hijackers. The hijackers flew the plane into the Pentagon at 9:37 a.m.
• United Airlines Flight 93: Left Newark International Airport at 8:42 a.m. enroute to San Francisco, with a crew of seven and 33 passengers, not including four hijackers. After the passengers revolted, the hijackers crashed the plane into the ground near Shanksville, Pennsylvania at 10:03 a.m.

Media coverage was intense during the attacks and aftermath, beginning moments after the first crash into the World Trade Center.

Events

At 8:46 a.m., five hijackers crashed American Airlines Flight 11 into the World Trade Center’s North Tower (1 WTC), and at 9:03 a.m., another five hijackers crashed United Airlines Flight 175 into the South Tower (2 WTC).Five hijackers flew American Airlines Flight 77 into the Pentagon at 9:37 a.m.

A fourth flight, United Airlines Flight 93, under the control of four hijackers, crashed near Shanksville, Pennsylvania, southeast of Pittsburgh, at 10:03 a.m. after the passengers fought the hijackers. Flight 93’s target is believed to have been either the Capitol or the White House. Flight 93’s cockpit voice recorder revealed crew and passengers tried to seize control of the plane from the hijackers after learning through phone calls that similarly hijacked planes had been crashed into buildings that morning. Once it became evident to the hijackers that the passengers might regain control of the plane, the hijackers rolled the plane and intentionally crashed it.

Some passengers and crew members who called from the aircraft using the cabin airphone service and mobile phones provided details: several hijackers aboard each plane; they used mace, tear gas, or pepper spray to overcome attendants; and some people aboard had been stabbed. Reports indicated hijackers stabbed and killed pilots, flight attendants, and one or more passengers. In their final report, the 9/11 Commission found the hijackers had recently purchased multi-function hand tools and assorted knives and blades. A flight attendant on Flight 11, a passenger on Flight 175, and passengers on Flight 93 said the hijackers had bombs, but one of the passengers said he thought the bombs were fake. The FBI found no traces of explosives at the crash sites, and the 9/11 Commission concluded that the bombs were probably fake.

Three buildings in the World Trade Center complex collapsed due to fire-induced structural failure. The South Tower collapsed at 9:59 a.m. after burning for 56 minutes in a fire caused by the impact of United Airlines Flight 175 and the explosion of its fuel. The North Tower collapsed at 10:28 a.m. after burning for 102 minutes. When the North Tower collapsed, debris fell on the nearby 7 World Trade Center building (7 WTC), damaging it and starting fires. These fires burned for hours, compromising the building’s structural integrity, and 7 WTC collapsed at 5:21 p.m. The Pentagon sustained major damage.

At 9:40 a.m., the FAA grounded all aircraft within the continental U.S., and aircraft already in flight were told to land immediately. All international civilian aircraft were either turned back or redirected to airports in Canada or Mexico, and all international flights were banned from landing on U.S. soil for three days. The attacks created widespread confusion among news organizations and air traffic controllers. Among the unconfirmed and often contradictory news reports aired throughout the day, one of the most prevalent said a car bomb had been detonated at the U.S. State Department’s headquarters in Washington, D.C. Another jet—Delta Air Lines Flight 1989—was suspected of having been hijacked, but the aircraft responded to controllers and landed safely in Cleveland, Ohio.

In a September 2002 interview, Khalid Sheikh Mohammed and Ramzi bin al-Shibh, who are believed to have organized the attacks, said Flight 93’s intended target was the United States Capitol, not the White House. During the planning stage of the attacks, Mohamed Atta, the hijacker and pilot of Flight 11, thought the White House might be too tough a target and sought an assessment from Hani Hanjour, who would later hijack and pilot Flight 77. Mohammed said al-Qaeda initially planned to target nuclear installations rather than the World Trade Center and the Pentagon, but decided against it, fearing things could “get out of control.” Final decisions on targets, according to Mohammed, were left in the hands of the pilots.

Casualties

The attacks resulted in the deaths of 2,996 people, including the 19 hijackers and 2,977 victims.The victims included 246 on the four planes (from which there were no survivors), 2,606 in New York City in the towers and on the ground, and 125 at the Pentagon.Nearly all of the victims were civilians; 55 military personnel were among those killed at the Pentagon.

More than 90% of the workers and visitors who died in the towers had been at or above the points of impact. In the North Tower 1,355 people at or above the point of impact were trapped and died of smoke inhalation, fell or jumped from the tower to escape the smoke and flames, or were killed in the building’s eventual collapse. The destruction of all three staircases in the tower when Flight 11 hit made it impossible for anyone above the impact zone to escape. One hundred-seven people below the point of impact died as well.

In the South Tower, one stairwell (A), was left intact after Flight 175 hit, allowing 14 people located on the floors of impact (including one man who saw the plane coming at him) and four more from the floors above to escape. 911 operators who received calls from individuals inside the tower were not well informed of the situation as it rapidly unfolded and as a result, told callers not to descend the tower on their own. 630 people died in that tower, fewer than half the number killed in the North Tower. Casualties in the South Tower were significantly reduced by some occupants deciding to start evacuating as soon as the North Tower was struck.

At least 200 people fell or jumped to their deaths from the burning towers (as exemplified in the photograph The Falling Man), landing on the streets and rooftops of adjacent buildings hundreds of feet below. Some occupants of each tower above the point of impact made their way toward the roof in hope of helicopter rescue, but the roof access doors were locked. No plan existed for helicopter rescues, and the combination of roof equipment and thick smoke and intense heat prevented helicopters from approaching. A total of 411 emergency workers died as they tried to rescue people and fight fires. The New York City Fire Department (FDNY) lost 340 firefighters, a chaplain and two paramedics.The New York City Police Department (NYPD) lost 23 officers. The Port Authority Police Department lost 37 officers. Eight emergency medical technicians (EMTs) and paramedics from private emergency medical services units were killed.

Cantor Fitzgerald L.P., an investment bank on the 101st–105th floors of the North Tower, lost 658 employees, considerably more than any other employer. Marsh Inc., located immediately below Cantor Fitzgerald on floors 93–100, lost 358 employees, and 175 employees of Aon Corporation were also killed. The National Institute of Standards and Technology (NIST) estimated that about 17,400 civilians were in the World Trade Center complex at the time of the attacks. Turnstile counts from the Port Authority suggest 14,154 people were typically in the Twin Towers by 8:45 a.m. The vast majority of people below the impact zone safely evacuated the buildings.

After New York, New Jersey lost the most state citizens, with the city of Hoboken sustaining the most deaths.More than 90 countries lost citizens in the attacks on the World Trade Center. Two people were added to the official death toll after dying from health conditions linked to exposure to dust from the collapse of the World Trade Center.

Weeks after the attack, the death toll was estimated to be over 6,000, more than twice the number of deaths eventually confirmed. The city was only able to identify remains for about 1,600 of the World Trade Center victims. The medical examiner’s office collected “about 10,000 unidentified bone and tissue fragments that cannot be matched to the list of the dead”. Bone fragments were still being found in 2006 by workers who were preparing to demolish the damaged Deutsche Bank Building. In 2010, a team of anthropologists and archaeologists searched for human remains and personal items at the Fresh Kills Landfill, where seventy-two more human remains were recovered, bringing the total found to 1,845. DNA profiling continues in an attempt to identify additional victims. As of August 2011, 1,631 victims have been identified, while 1,122 (41%) of the victims remained unidentified. The remains are being held in storage in Memorial Park, outside the New York City Medical Examiner’s facilities. It is expected that the remains will be moved in 2013 to a repository behind a wall at the 9/11 museum. As of July 2011, a team of scientists at the Office of Chief Medical Examiner continues to try to identify remains, in the hope that improved technology will allow them to identify other victims.

Damage

Along with the 110-floor Twin Towers, numerous other buildings at the World Trade Center site were destroyed or badly damaged, including WTC buildings 3 through 7 and St. Nicholas Greek Orthodox Church. The North Tower, South Tower, the Marriott Hotel (3 WTC) and 7 WTC were completely destroyed. The U.S. Customs House (6 World Trade Center), 4 World Trade Center, 5 World Trade Center, and both pedestrian bridges connecting buildings were severely damaged. The Deutsche Bank Building on 130 Liberty Street was partially damaged and demolished later. The two buildings of the World Financial Center also suffered damage.

The Deutsche Bank Building across Liberty Street from the World Trade Center complex was later condemned as uninhabitable because of toxic conditions inside the office tower, and was deconstructed. The Borough of Manhattan Community College’s Fiterman Hall at 30 West Broadway was condemned due to extensive damage in the attacks, and is being rebuilt. Other neighboring buildings including 90 West Street and the Verizon Building suffered major damage but have been restored. World Financial Center buildings, One Liberty Plaza, the Millenium Hilton, and 90 Church Street had moderate damage and have since been restored. Communications equipment on top of the North Tower was also destroyed, but media stations were quickly able to reroute signals and resume broadcasts.

The Pentagon was severely damaged by the impact of American Airlines Flight 77 and ensuing fires, causing one section of the building to collapse. As it approached the Pentagon, the airplane’s wings knocked over light poles and its right engine smashed into a power generator before crashing into the western side of the building, killing all 53 passengers, 5 hijackers, and 6 crew. The plane hit the Pentagon at the first-floor level. The front part of the fuselage disintegrated on impact, while the mid and tail sections kept moving for another fraction of a second. Debris from the tail section penetrated furthest into the building, breaking through 310 feet (94 m) of the three outermost of the building’s five rings.

Rescue and recovery

The New York City Fire Department deployed 200 units (half of the department) to the site. Their efforts were supplemented by numerous off-duty firefighters and emergency medical technicians.The New York City Police Department sent Emergency Service Units and other police personnel, and deployed its aviation unit. Once on the scene, the FDNY, NYPD, and Port Authority police did not coordinate efforts and performed redundant searches for civilians.As conditions deteriorated, the NYPD aviation unit relayed information to police commanders, who issued orders for its personnel to evacuate the towers; most NYPD officers were able to safely evacuate before the buildings collapsed. With separate command posts set up and incompatible radio communications between the agencies, warnings were not passed along to FDNY commanders.

After the first tower collapsed, FDNY commanders issued evacuation warnings; however, due to technical difficulties with malfunctioning radio repeater systems, many firefighters never heard the evacuation orders. 9-1-1 dispatchers also received information from callers that was not passed along to commanders on the scene.Within hours of the attack, a substantial search and rescue operation was launched. After months of around-the-clock operations the World Trade Center site was cleared by the end of May 2002.

Attackers and their background

al-Qaeda

The origins of al-Qaeda can be traced to 1979 when the Soviet Union invaded Afghanistan. Osama bin Laden traveled to Afghanistan and helped organize Arab mujahideen to resist the Soviets. Under the guidance of Ayman al-Zawahiri, bin Laden became more radical. In 1996 bin Laden issued his first fatwā, calling for American soldiers to leave Saudi Arabia.

In a second fatwā in 1998, bin Laden outlined his objections to American foreign policy with respect to Israel, as well as the continued presence of American troops in Saudi Arabia after the Gulf War. Bin Laden used Islamic texts to exhort Muslims to attack Americans until the stated grievances are reversed, and according to bin Laden, Muslim legal scholars, “have throughout Islamic history unanimously agreed that the jihad is an individual duty if the enemy destroys the Muslim countries.”

Osama bin Laden

Bin Laden, who orchestrated the attacks, initially denied but later admitted involvement. Al Jazeera broadcast a statement by bin Laden on September 16, 2001, stating, “I stress that I have not carried out this act, which appears to have been carried out by individuals with their own motivation.” In November 2001, U.S. forces recovered a videotape from a destroyed house in Jalalabad, Afghanistan. In the tape, bin Laden is seen talking to Khaled al-Harbi and admits foreknowledge of the attacks. On December 27, 2001, a second bin Laden video was released. In the video, he said, “Terrorism against America deserves to be praised because it was a response to injustice, aimed at forcing America to stop its support for Israel, which kills our people”, but he stopped short of admitting responsibility for the attacks.

Shortly before the U.S. presidential election in 2004, in a taped statement, bin Laden publicly acknowledged al-Qaeda’s involvement in the attacks on the U.S. and admitted his direct link to the attacks. He said that the attacks were carried out because, “we are free … and want to regain freedom for our nation. As you undermine our security we undermine yours.” Bin Laden said he had personally directed his followers to attack the World Trade Center. Another video obtained by Al Jazeera in September 2006 shows bin Laden with Ramzi bin al-Shibh, as well as two hijackers, Hamza al-Ghamdi and Wail al-Shehri, as they make preparations for the attacks. The U.S. never formally indicted bin Laden for the 9/11 attacks but he was on the FBI’s Most Wanted List for the bombings of the U.S. Embassies in Dar es Salaam, Tanzania, and Nairobi, Kenya. After a nearly 10-year manhunt, bin Laden was killed by American special forces in a compound in Abbottabad, Pakistan on May 2, 2011.

Khalid Sheikh Mohammed

The journalist Yosri Fouda of the Arabic television channel Al Jazeera reported that in April 2002, Khalid Sheikh Mohammed admitted his involvement, along with Ramzi bin al-Shibh. The 9/11 Commission Report determined that the animosity towards the United States felt by Mohammed, the principal architect of the 9/11 attacks, stemmed from his “violent disagreement with U.S. foreign policy favoring Israel”.

Mohammed was also an adviser and financier of the 1993 World Trade Center bombing and the uncle of Ramzi Yousef, the lead bomber in that attack.

Mohammed was arrested on March 1, 2003, in Rawalpindi, Pakistan by Pakistani security officials working with the CIA, then transported to Guantanamo Bay and interrogated using methods including waterboarding. During U.S. hearings at Guantanamo Bay in March 2007, Mohammed again confessed his responsibility for the attacks, stating he “was responsible for the 9/11 operation, from A to Z” and that his statement was not made under duress.

Other al-Qaeda members

In “Substitution for Testimony of Khalid Sheikh Mohammed” from the trial of Zacarias Moussaoui, five people are identified as having been completely aware of the operation’s details. They are bin Laden, Khalid Sheikh Mohammed, Ramzi bin al-Shibh, Abu Turab al-Urduni and Mohammed Atef. To date, only peripheral figures have been tried or convicted for the attacks.

On September 26, 2005, the Spanish high court sentenced Abu Dahdah to 27 years in prison for conspiracy on the 9/11 attacks and being a member of the terrorist organization al-Qaeda. At the same time, another 17 al-Qaeda members were sentenced to penalties of between six and eleven years. On February 16, 2006, the Spanish Supreme Court reduced the Abu Dahdah penalty to 12 years because it considered that his participation in the conspiracy was not proven.

Also in 2006, Moussaoui, who some originally suspected might have been the assigned 20th hijacker, was convicted for the lesser role of conspiracy to commit acts of terrorism and air piracy. He is serving a life sentence without parole. Mounir el-Motassadeq, an associate of the Hamburg-based hijackers, is serving 15 years for his role in helping the hijackers prepare for the attacks.

The Hamburg cell in Germany included radical Islamists who eventually came to be key operatives in the 9/11 attacks. Mohamed Atta, Marwan al-Shehhi, Ziad Jarrah, Ramzi bin al-Shibh, and Said Bahaji were all members of al-Qaeda’s Hamburg cell.

Motives

Osama bin Laden’s declaration of a holy war against the United States, and a fatwā signed by bin Laden and others calling for the killing of American civilians in 1998, are seen by investigators as evidence of his motivation.In various pronouncements before and after the attacks,al-Qaeda explicitly cited three motives for its activities against Western countries: the presence of U.S. troops in Saudi Arabia, U.S. support of Israel,and sanctions against Iraq. After the attacks, bin Laden and al-Zawahiri released additional video tapes and audio tapes, some of which repeated those reasons for the attacks. Two particularly important publications were bin Laden’s 2002 “Letter to America”, and a 2004 video tape by bin Laden.

Bin Laden interpreted the Prophet Muhammad as having banned the “permanent presence of infidels in Arabia”. In 1996, bin Laden issued a fatwā calling for American troops to leave Saudi Arabia. In 1998, al-Qaeda wrote, “for over seven years the United States has been occupying the lands of Islam in the holiest of places, the Arabian Peninsula, plundering its riches, dictating to its rulers, humiliating its people, terrorizing its neighbors, and turning its bases in the Peninsula into a spearhead through which to fight the neighboring Muslim peoples.” In a December 1999, interview, bin Laden said he felt that Americans were “too near to Mecca”, and considered this a provocation to the entire Muslim world. One analysis of suicide terrorism suggested that without U.S. troops in Saudi Arabia, al-Qaeda likely would not have been able to get people to commit suicide in this way.

In his November 2002 “Letter to America”, bin Laden cited the United States’ support of Israel as a motivation: “The creation and continuation of Israel is one of the greatest crimes, and you are the leaders of its criminals. And of course there is no need to explain and prove the degree of American support for Israel. The creation of Israel is a crime which must be erased. Each and every person whose hands have become polluted in the contribution towards this crime must pay its price, and pay for it heavily.” In 2004 and 2010, bin Laden again connected the September 11 attacks with U.S. support of Israel. Bin Laden claimed in 2004 that the idea of destroying the towers had first occurred to him in 1982, when he witnessed Israel’s bombardment of high-rise apartment buildings during the invasion of Lebanon.Several analysts, including Mearsheimer and Walt, also say one motivation for the attacks was U.S. support of Israel. In the 1998 fatwā, al-Qaeda identified the Iraq sanctions as a reason to kill Americans, condemning the “protracted blockade” among other actions constituting a declaration of war against “Allah, his messenger, and Muslims.”

In addition to those cited by bin Laden and al-Qaeda, analysts have suggested other motives, including western support of non-Islamist authoritarian regimes in Saudi Arabia, Iran, Iraq, Pakistan and northern Africa, and western troops in some of these countries. Other authors suggest that humiliation resulting from the Islamic world falling behind the Western world – this discrepancy made especially visible by recent globalization – and a desire to provoke the U.S. into a broader war against the Islamic world, in the hope of motivating more allies to support al-Qaeda. Others have argued that 9/11 was a strategic way to provoke America into a war that incites a pan-Islamic revolution.

Planning of the attacks

The idea for the attacks came from Khalid Sheikh Mohammed, who first presented it to Osama bin Laden in 1996. At that time, bin Laden and al-Qaeda were in a period of transition, having just relocated back to Afghanistan from Sudan.The 1998 African Embassy bombings and bin Laden’s 1998 fatwā marked a turning point, as bin Laden became intent on attacking the United States.

In late 1998 or early 1999, bin Laden gave approval for Mohammed to go forward with organizing the plot. A series of meetings occurred in early 1999, involving Mohammed, bin Laden, and his deputy Mohammed Atef. Atef provided operational support for the plot, including target selections and helping arrange travel for the hijackers. Bin Laden overruled Mohammed, rejecting some potential targets such as the U.S. Bank Tower in Los Angeles because, “there was not enough time to prepare for such an operation”.

Bin Laden provided leadership and financial support for the plot, and was involved in selecting participants. Bin Laden initially selected Nawaf al-Hazmi and Khalid al-Mihdhar, both experienced jihadists who had fought in Bosnia. Hazmi and Mihdhar arrived in the United States in mid-January 2000. In spring 2000, Hazmi and Mihdhar took flying lessons in San Diego, California, but both spoke little English, did poorly with flying lessons, and eventually served as secondary – or “muscle” – hijackers.

In late 1999, a group of men from Hamburg, Germany arrived in Afghanistan, including Mohamed Atta, Marwan al-Shehhi, Ziad Jarrah, and Ramzi bin al-Shibh.Bin Laden selected these men because they were educated, could speak English, and had experience living in the west. New recruits were routinely screened for special skills and al-Qaeda leaders consequently discovered that Hani Hanjour already had a commercial pilot’s license.

Hanjour arrived in San Diego on December 8, 2000, joining Hazmi. They soon left for Arizona, where Hanjour took refresher training. Marwan al-Shehhi arrived at the end of May 2000, while Atta arrived on June 3, 2000, and Jarrah arrived on June 27, 2000. Bin al-Shibh applied several times for a visa to the United States, but as a Yemeni, he was rejected out of concerns he would overstay his visa and remain as an illegal immigrant. Bin al-Shibh stayed in Hamburg, providing coordination between Atta and Mohammed. The three Hamburg cell members all took pilot training in South Florida.

In spring 2001, the secondary hijackers began arriving in the United States. In July 2001, Atta met with bin al-Shibh in Spain, where they coordinated details of the plot, including final target selection. Bin al-Shibh also passed along bin Laden’s wish for the attacks to be carried out as soon as possible.

2000 USS Cole bombing

The USS Cole bombing was a suicide attack against the United States Navy guided-missile destroyer USS Cole (DDG-67) on 12 October 2000, while it was harbored and being refueled in the Yemen port of Aden. Seventeen American sailors were killed, and 39 were injured.This event was the deadliest attack against a United States Naval vessel since 1987.

The terrorist organization al-Qaeda claimed responsibility for the attack. A U.S. judge has held Sudan liable for the attack, while another has released over $13 million in Sudanese frozen assets to the relatives of those killed. The American Navy has reconsidered their rules of engagement in response to this attack.

Attack

On the morning of Thursday, 12 October 2000, USS Cole, under the command of Commander Kirk Lippold, docked in Aden harbor for a routine fuel stop. Cole completed mooring at 09:30. Refueling started at 10:30. Around 11:18 local time (08:18 UTC), a small craft approached the port side of the destroyer, and an explosion occurred, creating a 40-by-40-foot gash in the ship’s port side, according to the memorial plate to those who lost their lives. According to former CIA intelligence officer Robert Finke, the blast appeared to be caused by explosives molded into a shaped charge against the hull of the boat. Around 400 to 700 pounds (200–300 kg) of explosive were used.The blast hit the ship’s galley, where crew were lining up for lunch.The crew fought flooding in the engineering spaces and had the damage under control after 3 days. Divers inspected the hull and determined that the keel was not damaged.

17 sailors were killed and 39 were injured in the blast. The injured sailors were taken to the United States Army’s Landstuhl Regional Medical Center near Ramstein, Germany, and later, back to the United States. The attack was the deadliest against a U.S. Naval vessel since the Iraqi attack on the USS Stark on 17 May 1987. The asymmetric warfare attack was organized and directed by the terrorist organization al-Qaeda.^[5][6][7][8] In June 2001, an al-Qaeda recruitment video featuring Osama bin Laden boasted about the attack and encouraged similar attacks.

Al-Qaeda had previously attempted a similar but less publicized attack on the U.S. Navy destroyer USS The Sullivans while in port at Aden on 3 January 2000, as a part of the 2000 millennium attack plots. The plan was to load a boat full of explosives and explode it near The Sullivans. However the boat was so overladen that it sank, forcing the attack to be abandoned.

Planning for the attack was discussed at the Kuala Lumpur al-Qaeda Summit shortly after the attempt, which was held from 5 to 8 January 2000. Along with other plotters, it was attended by future 11 September hijacker Khalid al-Mihdhar, who then traveled to San Diego where he established a close relationship with “9/11 imam” Anwar al-Awlaki, who was later linked to numerous plots and attacks, including the Fort Hood shootings and the “underwear bomber” of 2009 and put on a targeted killing list by President Obama as a terrorist threat. On 10 June 2000, Mihdhar left San Diego to visit his wife in Yemen at a house also used as a communications hub for al-Qaeda.After the bombing, Yemeni Prime Minister Abdul Karim al-Iryani reported that Mihdhar had been one of the key planners of the attack and had been in the country at the time of the attacks.He would later return to the US to participate in 9/11 on American Airlines Flight 77, which flew into the Pentagon, killing 184 people.

Rescue

The first naval ship on the scene to assist the stricken Cole was the Royal Navy Type 23 frigate, HMS Marlborough, under the command of Capt Anthony Rix, RN. She was on passage to the UK after a six-month deployment in the Gulf. Marlborough had full medical and damage control teams on board and when her offer of assistance was accepted she immediately diverted to Aden. Eleven of the most badly injured sailors were sent via MEDEVAC to a French military hospital in Djibouti and underwent surgery before being sent to Germany.

The first U.S. military support to arrive was a Quick Response Force from the United States Air Force Security Forces, transported by C-130. They were followed by another small group of United States Marines from the Interim Marine Corps Security Force Company, Bahrain flown in by P-3. Both forces landed within a few hours after the ship was struck and were reinforced by a U.S Marine platoon with the 2nd Fleet Antiterrorism Security Team Company (FAST), based out of Yorktown, Virginia. The Marines from 4th Platoon, 2nd FAST arrived on the 13th from a security mission in Doha, Qatar. The FAST platoon secured the USS Cole and a nearby hotel that was housing the U.S. Ambassador to Yemen.

USS Donald Cook and USS Hawes made best speed to arrive in the vicinity of Aden that afternoon providing repair and logistical support. USNS Catawba, USS Camden, Anchorage, Duluth and Tarawa arrived in Aden some days later, providing watch relief crews, harbor security, damage control equipment, billeting, and food service for the crew of the Cole. LCU 1666 provided daily runs from the Tarawa with hot food and supplies and ferrying personnel to and from all other Naval vessels supporting USS Cole. In the remaining days LCU 1632 and various personnel from LCU 1666 teamed up to patrol around the Cole while the MV Blue Marlin was preparing to take up station to receive the Cole.

Investigation

In a form of transport pioneered in 1988 by the USS Samuel B. Roberts aboard the Mighty Servant 2, Cole was hauled from Aden aboard the Norwegian semi-submersible heavy lift salvage ship MV Blue Marlin. She arrived in Pascagoula, Mississippi, on 24 December 2000, where she was rebuilt.

U.S. FBI agents sent to Yemen to investigate the bombing in the days following the blast worked in an extremely hostile environment. They were met at the airport by Yemen special forces, “each soldier pointing an AK-47 at the plane.” Speakers in the Yemeni parliament “calling for jihad against America,” were broadcast on local television each night. After some delay, Yemenis produced a CCTV video from a harborside security camera, but with the crucial moment of the explosion deleted.”There were so many perceived threats that the agents often slept in their clothes and with their weapons at their sides.” At one point, the hotel where the agents stayed “was surrounded with men in traditional dress, some in jeeps, all carrying guns.” Finally the agents abandoned their hotel to stay at a Navy vessel in the Bay of Aden, but even that was not safe. After being granted “permission from the Yemeni government to fly back to shore,” their helicopter “was painted by an SA-7 missile” and “had to take evasive maneuvers”.

Responsibility

On 14 March 2007, a federal judge in the United States, Robert G. Doumar, ruled that the Sudanese government was liable for the bombing.

The ruling was issued in response to a lawsuit filed against the Sudanese government by relatives of the victims, who claim that al-Qaeda could not have carried out the attacks without the support of Sudanese officials. The judge stated “There is substantial evidence in this case presented by the expert testimony that the government of Sudan induced the particular bombing of the Cole by virtue of prior actions of the government of Sudan.” On 25 July 2007, Doumar ordered the Sudanese government to pay $8 million to the families of the 17 sailors who died. He calculated the amount they should receive by multiplying the salary of the sailors by the number of years they would have continued to work.Sudan’s Justice Minister Mohammed al-Mard has stated that Sudan intends to appeal the ruling.

By May 2008, all defendants convicted in the attack had escaped from prison or been freed by Yemeni officials.However, on 30 June 2008, Brig. Gen. Thomas W. Hartmann, legal advisor to the U.S. Military tribunal system, announced charges are being sworn against Abd al-Rahim al-Nashiri, a Saudi Arabian citizen of Yemeni descent, who has been held at the military prison in Guantanamo Bay, Cuba, since 2006. According to the Pentagon, the charges have been defined as “organizing and directing” the bombing of the USS Cole. The charges still must be approved by a Department of Defense official who oversees military commissions set up for terrorism suspects. The Pentagon will seek the death penalty.

Alleged mastermind

Several individuals have been described as the USS Cole bombing mastermind.

Among the allegations leveled by a Guantanamo Military Commission against Abd al-Rahim al-Nashiri,captured in late 2002, was that he was the mastermind of the USS Cole bombing.Al-Nashiri was one of the three “high-value detainees” the George W. Bush Presidency was to acknowledge had been subjected to waterboarding and other “extended interrogation techniques”.

Abu Ali al-Harithi was one of the first suspected terrorists to be targeted by a missile armed predator drone.He too was described as the mastermind of the USS Cole bombing. In 2003, the US Justice Department indicted two people who were believed to been the last main co-conspirators who were still at large, Jamal Mohammad Ahmad Al Badawi and Fahd al-Quso.

Jamal Mohammad Ahmad Al Badawi was convicted in Yemen, and sentenced to death. Fox News called Al-Badawi a “mastermind” of the Cole bombing. Al-Badawi was one of seventeen captives who escaped through a tunnel from a Yemeni jail in 2006.

According to CNN, Tawfiq bin Attash, who was captured in Pakistan 2003 and is currently being held in US custody at the Guantanamo Bay detention camp, was “considered the mastermind” of the bombing.An Al Qaeda commander in Yemen also confirmed that another co-conspirator in the bombing, Abdul Mun’im Salim al-Fatahani, was killed in a US drone strike on 31 January 2012.On 6 May 2012, officials from the Yemen government reported that al-Quso was killed in an airstrike earlier in the day in southern Yemen. The report was later confirmed by US officials and Al Qaeda’s media network As-Sahab.

Aftermath

The destroyer’s rules of engagement, as approved by the Pentagon, kept its guards from firing upon the small boat (which was not known to be loaded with explosives) as it neared them without first obtaining permission from the Cole‘s captain or another officer.

Petty Officer John Washak said that right after the blast, a senior chief petty officer ordered him to turn an M-60 machine gun on the Cole‘s fantail away from a second small boat approaching. “With blood still on my face,” he said, he was told: “That’s the rules of engagement: no shooting unless we’re shot at.” He added, “In the military, it’s like we’re trained to hesitate now. If somebody had seen something wrong and shot, he probably would have been court-martialed.” Petty Officer Jennifer Kudrick said that if the sentries had fired on the suicide craft “we would have gotten in more trouble for shooting two foreigners than losing seventeen American sailors.”

Consequences

President Bill Clinton declared, “If, as it now appears, this was an act of terrorism, it was a despicable and cowardly act. We will find out who was responsible and hold them accountable”. Some critics have pointed out that, under U.S. law, an attack against a military target does not meet the legal definition of terrorism.

On 19 January 2001, the U.S. Navy completed and released its Judge Advocate General Manual (JAGMAN) investigation of the incident, concluding that Cole‘s commanding officer Commander Kirk Lippold “acted reasonably in adjusting his force protection posture based on his assessment of the situation that presented itself” when Cole arrived in Aden to refuel. The JAGMAN also concluded that “the commanding officer of Cole did not have the specific intelligence, focused training, appropriate equipment or on-scene security support to effectively prevent or deter such a determined, preplanned assault on his ship” and recommended significant changes in Navy procedures. In spite of this finding, Lippold was subsequently denied promotion and retired at the same rank of commander in 2007.

In Afghanistan the bombing was a “great victory for bin Laden. Al-Qaeda camps … filled with new recruits, and contributors from the Gulf States arrived … with petrodollars.”

Both the Clinton Administration and the Bush Administration have been criticized for failing to respond militarily to the attack on the USS Cole before 11 September 2001. The 9/11 Commission Report cites one source who said in February 2001, “[bin Laden] complained frequently that the United States had not yet attacked [in response to the Cole]… Bin Laden wanted the United States to attack, and if it did not he would launch something bigger.”

Evidence of al-Qaeda’s involvement was inconclusive for months after the attack. The staff of the 9/11 Commission found that al-Qaeda’s direction of the bombing was under investigation but “increasingly clear” on 11 November 2000. It was an “unproven assumption” in late November. By 21 December the CIA had made a “preliminary judgment” that “al Qaeda appeared to have supported the attack,” with no “definitive conclusion.”

Accounts thereafter are varied and somewhat contradictory. Then-National Security Advisor Condoleezza Rice told the Commission that when the administration took office on 20 January 2001, “We knew that there was speculation that the 2000 Cole attack was al Qaeda… We received, I think, on January 25 the same assessment [of al-Qaeda responsibility]. It was preliminary. It was not clear.”

The Washington Post reported that, on 9 February, Vice President Dick Cheney was briefed on bin Laden’s responsibility “without hedge.”

Newsweek reported that on the following day, “six days after Bush took office,” the FBI “believed they had clear evidence tying the bombers to Al Qaeda.”

These conclusions are contrasted by testimony of key figures before the 9/11 Commission, summarized in the 9/11 Commission Report. Former CIA Director George Tenet testified (page 196) that he “believed he laid out what was knowable early in the investigation, and that this evidence never really changed until after 9/11.” The report suggests (pages 201–202) that the official assessment was similarly vague until at least March 2001:

On January 25, Tenet briefed the President on the Cole investigation. The written briefing repeated for top officials of the new administration what the CIA had told the Clinton White House in November. This included the “preliminary judgment” that al Qaeda was responsible, with the caveat that no evidence had yet been found that Bin Ladin himself ordered the attack… in March 2001, the CIA’s briefing slides for Rice were still describing the CIA’s “preliminary judgment” that a “strong circumstantial case” could be made against al Qaeda but noting that the CIA continued to lack “conclusive information on external command and control” of the attack.

According to Rice, the decision not to respond militarily to the Cole bombing was President Bush’s. She said he “made clear to us that he did not want to respond to al Qaeda one attack at a time. He told me he was ‘tired of swatting flies.'” The administration instead began work on a new strategy to eliminate al-Qaeda.

As a result of the USS Cole bombing, the U.S. Navy began to reassess its anti-terrorism and force protection methods, both at home and abroad. The Navy stepped up Random Anti-Terrorism Measures (RAM), which are meant to complicate the planning of a terrorist contemplating an attack by making it difficult to discern a predictable pattern to security posture.

In November 2001, the Navy opened an Anti-Terrorism and Force Protection Warfare Center at Naval Amphibious Base (NAB) Little Creek, in Virginia Beach, Virginia, with the objective of developing tactics, equipment and training to combat terrorists.

On 3 November 2002, the CIA fired an AGM-114 Hellfire missile from a Predator UAV at a vehicle in Yemen carrying Abu Ali al-Harithi, a suspected planner of the bombing plot. Also in the vehicle was Ahmed Hijazi, a U.S. citizen. Both were killed.

On 29 September 2004, a Yemeni judge sentenced Abd al-Rahim al-Nashiri and Jamal al-Badawi to death for their roles in the bombing. Al-Nashiri, believed to be the operation’s mastermind, was detained by the U.S. at Guantanamo Bay detention camp. Al-Badawi, in Yemeni custody, denounced the verdict as “an American one.” Four others were sentenced to prison terms of five to 10 years for their involvement, including one Yemeni who had videotaped the attack.

In October 2004 the Navy consolidated the forces it deploys for anti-terrorism and force protection under a single command at NAB Little Creek. The new Maritime Force Protection Command (MARFPCOM) was activated to oversee the administration and training of the expeditionary units the Navy deploys overseas to protect ships, aircraft and bases from terrorist attack. MARFPCOM aligned four existing components: the Mobile Security Forces, Naval Coastal Warfare, Explosive Ordnance Disposal (EOD), and Expeditionary Mobile Diving and Salvage Forces.

On 3 February 2006, 23 suspected or convicted Al-Qaeda members escaped from jail in Yemen. This number included 13 who were convicted of the bombings of USS Cole and the French tanker Limburg in 2002. Among those who reportedly escaped was Al-Badawi. Al-Qaeda’s Yemeni number two Abu Assem al-Ahdal may also have escaped.

On 17 October 2007, al-Badawi surrendered to Yemeni authorities as part of an agreement with al-Qaeda militants. Following his surrender, Yemeni authorities released him in return for a pledge not to engage in any violent or al-Qaeda-related activity, despite a US$5 million reward for his capture. Two other escapees remained at large.

In June 2008 the United States charged Abd al-Rahim al-Nashiri with planning and conducting the attack. The US planned to seek the death penalty in his case.On 5 February 2009, the United States dropped all charges against al-Nashiri “without prejudice” to comply with President Obama’s order to shut down the military prison at Guantanamo Bay, but reserved the right to file charges at a later date. Charges were reinstated in 2011.

In 2009 U.S. federal judge Kimba Wood released $13.4 million in frozen assets belonging to Sudan to be awarded to 33 spouses, parents, and children of the sailors killed in the attack. The money was awarded based on the Terrorism Risk Insurance Act of 2002. Previously, the court had found Sudan culpable in facilitating the attack on the destroyer. Said John Clodfelter, father of Kenneth Clodfelter who was killed in the bombing, “It’s about time something was done. It’s taken so much more time than we thought it should take.”

The USS Cole bombing plays a highly visible role in Navy damage-control training, which begins in boot camp with a pre-graduation Battle Stations event. “The Cole Scenario” launched in 2007 takes place aboard a realistic destroyer mock-up housed at Naval Station Great Lakes, Ill. The training focuses on preparing recruits for damage control challenges they may face in the fleet.

1998 United States embassy bombings

The 1998 United States embassy bombings were a series of attacks that occurred on August 7, 1998, in which hundreds of people were killed in simultaneous truck bomb explosions at the United States embassies in the East African capitals of Dar es Salaam, Tanzania, and Nairobi, Kenya. The date of the bombings marked the eighth anniversary of the arrival of American forces in Saudi Arabia.

The attacks were linked to local members of the Egyptian Islamic Jihad, brought Osama bin Laden and Ayman al-Zawahiri to the attention of the American public for the first time, and resulted in the U.S. Federal Bureau of Investigation placing bin Laden on its Ten Most Wanted Fugitives list. The FBI also connected the attack to Azerbaijan, as 60 calls via satellite phone were placed by Bin Laden to associates in Baku regarding the strike. Fazul Abdullah Mohammed was credited for being the mastermind behind the bombings.Since that time, Saif al-Adel, an Egyptian explosives expert and member of al-Qaeda, has also been indicted for his part in the bombings.

The bombings are widely believed to have been revenge for American involvement in the extradition, and alleged torture, of four members of Egyptian Islamic Jihad (EIJ) who had been arrested in Albania in the two months prior to the attacks.Between June and July, Ahmad Isma’il ‘Uthman Saleh, Ahmad Ibrahim al-Sayyid al-Naggar, Shawqi Salama Mustafa Atiya and Mohamed Hassan Tita were all renditioned from Albania to Egypt, with the cooperation of the United States; the four men were accused of participating in the assassination of Rifaat el-Mahgoub, as well as a later plot against the Khan el-Khalili market in Cairo.The following month, a communique was issued warning the United States that a “response” was being prepared to repay them for their interference.

According to journalist Lawrence Wright, the Nairobi operation was named after the Holy Kaaba in Mecca; the Dar es Salaam bombing was called Operation al-Aqsa in Jerusalem, but “neither had an obvious connection to the American embassies in Africa. Bin Laden initially said that the sites had been targeted because of the ‘invasion’ of Somalia; then he described an American plan to partition Sudan, which he said was hatched in the embassy in Nairobi. He also told his followers that the genocide in Rwanda had been planned inside the two American embassies.”

Wright concludes that bin Laden’s actual goal was “to lure the United States into Afghanistan, which had long been called ‘The Graveyard of Empires.'” According to a 1998 memo authored by Mohammed Atef and seized by the FBI, around the time of the attacks, al-Qaeda had both an interest in and specific knowledge of negotiations between the Taliban and the American-led gas pipeline consortium CentGas.

In May 1998, a villa in Nairobi was purchased by one of the bombers for the purpose of accommodating bomb building in the garage. Sheikh Ahmed Salim Swedan purchased a beige Toyota Dyna truck in Nairobi and a 1987 Nissan Atlas refrigeration truck in Dar es Salaam. Six metal bars were used to form a “cage” on the back of the Atlas to accommodate the bomb.

In June 1998, KK Mohamed rented House 213 in the Illala district of Dar es Salaam, about four miles (6 km) from the U.S. Embassy. A white Suzuki Samurai was used to haul bomb components hidden in rice sacks, from House 213.

In both Nairobi and Dar es Salaam, Mohammed Odeh supervised construction of two massive, 900kg destructive devices. The Nairobi bomb was made of 400 to 500 cylinders of TNT (about the size of soda cans), aluminum nitrate, aluminum powder and detonating cord. The explosives were packed into some twenty specially designed wooden crates that were sealed and then placed in the bed of the trucks. Muhsin Musa Matwalli Atwah ran a wire from the bomb to a set of batteries in the back of the truck cab and then to a detonator switch beneath the dashboard. The Dar es Salaam bomb used a slightly different construction: the TNT was attached to fifteen oxygen tanks and gas canisters, and was surrounded with four bags of ammonium nitrate fertilizer and some sand bags to tamp and direct the blast.

The bombings were scheduled for August 7, the eighth anniversary of the arrival of American troops in Saudi Arabia, likely a choice by Osama bin Laden.

Attacks and casualties

On August 7, between 10:30 am and 10:40 am local time (3:30–3:40 am Washington time), suicide bombers in trucks laden with explosives parked outside the embassies in Dar es Salaam and Nairobi, and almost simultaneously detonated. In Nairobi, approximately 212 people were killed, and an estimated 4,000 wounded; in Dar es Salaam, the attack killed at least 11 and wounded 85.Seismological readings analyzed after the bombs indicated energy of between 3–17 tons of high explosive material. Although the attacks were directed at American facilities, the vast majority of casualties were local citizens; 12 Americans were killed,including two Central Intelligence Agency employees in the Nairobi embassy, Tom Shah and Molly Huckaby Hardy, and one Marine, Sergeant Jesse Aliganga, a Marine Security Guard at the Nairobi embassy.

While driver Azzam drove the Toyota Dyna quickly toward the Nairobi embassy along with Mohamed Rashed Daoud Al-Owhali,local security guard Benson Okuku Bwaku was warned to open the gate immediately – and fired upon when he refused to comply. Al-Owhali threw a stun grenade at embassy guards before exiting the vehicle and running off.Osama bin Laden later offered the explanation that it had been Al-Owhali’s intention to leap out and shoot the guards to clear a path for the truck, but that he had left his pistol in the truck and subsequently ran off. As Bwaku radioed to Marine Post One for backup, the truck detonated.

The explosion damaged the embassy building and flattened the neighbouring Ufundi Building where most victims were killed, mainly students and staff of a secretarial college housed here. The heat from the blast was channelled between the buildings towards Haile Selassie Avenue where a packed commuter bus was burned. Windows were shattered in a radius of nearly one kilometer. A large number of eye injuries occurred because people in buildings nearby who had heard the first explosion of the hand grenade and the shooting went to their office windows to have a look when the main blast occurred and shattered the windows.

Meanwhile, the Atlas truck in Dar es Salaam was being driven by Hamden Khalif Allah Awad, known as “Ahmed the German” due to his blonde hair, a former camp trainer who had arrived in the country only a few days earlier.The death toll was less than in Nairobi as the U.S. embassy was located outside the city center on Bagamoyo Road on a large plot with no immediate neighbours close to the gate where the explosion occurred.

Following the attacks, a group calling itself the “Liberation Army for Holy Sites” took credit for the bombings. American investigators believe the term was a cover used by Egyptian Islamic Jihad, who had actually perpetrated the bombing.

Aftermath and international response

In response to the bombings, President Bill Clinton ordered Operation Infinite Reach, a series of cruise missile strikes on targets in Sudan and Afghanistan on August 20, 1998, announcing the planned strike in a prime time address on American television.

In Sudan, the missiles destroyed the Al-Shifa pharmaceutical factory, where 50% of Sudan’s medications for both people and animals were manufactured. The Clinton administration claimed that there was ample evidence to prove that the plant produced chemical weapons, but a thorough investigation after the missile strikes revealed that the intelligence was false.

The United Nations Security Council passed Resolution 1189 condemning the attacks on the embassies. There were no resolutions passed condemning the attacks on the Al-Shifa pharmaceutical factory.

Both embassies were heavily damaged and the Nairobi embassy had to be rebuilt. It is now located across the road from the office of the World Food Programme for security purposes. A few months after the attacks and subsequent American missile strikes in Afghanistan, the American energy company Unocal withdrew its plans for a gas pipeline through Afghanistan.

Within months following the bombings, the United States Department of State Bureau of Diplomatic Security added Kenya to its Antiterrorism Assistance Program (ATA), which was originally created in 1983. While the addition was largely a formality to reaffirm America’s commitment to fighting terrorism in Kenya, it nonetheless sparked the beginning of an active bilateral antiterrorism campaign between the United States and Kenya. The U.S. Government also rapidly and permanently increased the monetary aid to Kenya. Immediate changes included a $42 million grant targeted specifically towards Kenyan victims.

1996 Khobar Towers bombing

The Khobar Towers bombing was a terrorist attack on part of a housing complex in the city of Khobar, Saudi Arabia, located near the national oil company (Saudi Aramco) headquarters of Dhahran on June 25, 1996. At that time Khobar Towers was being used as quarters for foreign military personnel.

A huge truck-bomb was detonated adjacent to Building #131, an eight-story structure housing United States Air Force personnel from the 4404th Wing (Provisional), primarily from a deployed rescue squadron and deployed fighter squadron. In all, 19 U.S. servicemen were killed and 498 of many nationalities were wounded. Although Al-Qaeda has been described by some sources as the likely culprit, the official June 25, 1996 statement by the United States named members of Hezbollah Al-Hejaz (Party of God in the Hijaz) as responsible.

The attack

A November 13, 1995 car bombing in Riyadh led the U.S. forces stationed at Khobar Towers to raise the threat condition to THREATCON CHARLIE. Days after the attack, military commanders briefed soldiers and airmen at Khobar that the U.S. had received anonymous communications from an organization claiming to have carried out the Riyadh attack. The attackers claimed their goal was to get the United States’ military to leave the country, and that Khobar Towers would be attacked next if troop withdrawal did not begin immediately. It was at this time that surveillance and other suspicious activity near the perimeter fences of Khobar Towers was noted by United States Air Force Security Forces, however, the forces were forbidden by the Saudi government to act in any capacity outside the perimeter of the compound, and the surveillance continued with near impunity.

The attackers were reported to have smuggled explosives into Saudi Arabia from Lebanon. In Saudi Arabia, they purchased a large gas tanker truck and converted it into a bomb. Al-Mughassil, Al-Houri, Al-Sayegh, Al-Qassab, and the unidentified Lebanese man bought a tanker truck in early June 1996. Over a two-week period they converted it into a truck bomb. The group now had about 5,000 pounds of plastic explosives, enough to produce a shaped charge that detonated with the force of at least 20,000 pounds of TNT, according to a later assessment of the Defense Special Weapons Agency. The power of the blast was magnified several ways. The truck itself shaped the charge by directing the blast toward the building. Moreover, the relatively high clearance between the truck and the ground gave it the more lethal characteristics of an airburst.

It was originally estimated by U.S. authorities to have contained 3,000 to 5,000 pounds of explosives. Later the General Downing report on the incident suggested that the explosion contained the equivalent of 20,000 to 30,000 pounds of TNT. The attackers prepared for the attack by hiding large amounts of explosive materials and timing devices in paint cans and 50-kilogram bags, underground in Qatif near Khobar. The bomb was a mixture of gasoline and explosive powder placed in the tank of a sewage tanker truck.

Initially, the attackers attempted to enter the compound at the main checkpoint. When they were denied access by U.S. military personnel, at around 9:43 p.m. local time, they drove a Datsun scout vehicle, another car and the bomb truck, to a parking lot adjacent to building #131. A chain link security fence and a line of small trees separated the parking lot, used for a local mosque and park, from the housing compound. The perimeter of Building #131 was approximately 72 feet (22 m) from the fence line, with a perimeter road between the fence and building which was often used by military personnel for jogging. The first car entered the parking lot and signaled the others by flashing headlights. The bomb truck and a getaway vehicle followed shortly after. The men parked the truck next to the fence and left in the third vehicle. The bomb exploded three to four minutes later at approximately 9:50 p.m. local time.

An American sentry, Air Force Staff Sergeant Alfredo R. Guerrero, was stationed atop Building #131. He witnessed the men, recognized the vehicles as a threat, reported it to security, and began a floor by floor evacuation of the building. His actions are credited with saving dozens of lives. Many of the evacuees were in the stairwell when the bomb went off. The stairwell was constructed of heavy marble and was located on the side of the building away from the truck bomb, perhaps the safest location in the building. For his actions, Guerrero was awarded the Airman’s Medal, the United States Air Force highest peacetime award for valor.

Another security measure is thought to have minimized damage; along the security fence were Jersey barriers, concrete barriers commonly used along roadways. These deflected the blast energy upward, and away from the lower floors of the building, perhaps even preventing a total collapse of the structure.

The force of the explosion was enormous. The size of the explosion created an intense dust storm as the forces of the high pressure blast wave and the subsequent vacuum forces caused considerable damage in their own right. Several military vehicles parked to the left side of building #131 suffered no direct impact from debris, but were heavily damaged by the sheer intensity of the shock wave.

It heavily damaged or destroyed six high rise apartment buildings in the complex. Windows were shattered in virtually every other building in the compound and in surrounding buildings up to a mile away. A very large crater, 85 feet (26 m) wide and 35 feet (11 m) deep, was left where the truck had been and within a few hours was filling up partially with salt-water from the Persian Gulf, which is less than one mile (1.6 km) away. The blast was felt 20 miles (32 km) away in the Persian Gulf state of Bahrain. In the minutes following the blast, the residents of the complex evacuated severely injured U.S. military personnel from the area. With power out in many of the buildings near #131, the scene was chaotic and tense as little was known about the safety of the area from further attacks. Many residents later gathered in the local dining facility, set up as a triage center, and saw breaking news of the event on large projection televisions intended to bring news of events back home to the troops.